It is buried in an odd part of the FAQ, found on
www.the-holocron.com, which was written by the official rules rep when the game was in production.
Q: Could I use the abilities listed above part way through a move then continue the move sort of like Mobile Attack? Or in the middle of an attack maybe to Transfer Essence before someone could use Lightsaber Riposte for example?
A: No. You must complete the move/attack/ability in progress before declaring another ability.
It is refering to other "0 time" force powers, like Force Stun and Jedi Mind Trick, which work just like Targetting in terms of timing and when you can use them.